Rutabagas have become an almost-whole-family-approved veggie since we first tried them a few months ago, and a ranch seasoning blend is always a huge hit around here. This is the ratio of herbs/seasonings my family enjoys in the ranch seasoning blend, but you can adjust as necessary to suit your taste.
Roasting rutabagas brings out a slight sweetness, and everyone I serve them to thinks they are potatoes at first. They have a mild flavor similar to a Yukon gold potato (as long as you store them in a cool dark place and use them before they develop soft spots or grow sprouts), and their texture is very firm like a carrot. Use a very sharp knife when peeling and dicing and work on a stable surface!